Multiple-part plastic pump for liquids



Dec. 22, 1964 E. DAVIDSON MULTIPLE-PART PLASTIC PUMP FOR LIQUIDS 3 Sheets-Sheet 1 Filed July 30, 1959 m h M 8 4 wzaa f \\F\ A 2 /w 7 F a a I 05 HZ a Na 1] M 0 y E 0 MM I Dec. 22, 1964 E. DAVIDSON 3,162,333

MULTIPLE-PART PLASTIC RUMP FOR LIQUIDS Filed July 30, 1959 I 3 Sheets-Sheet 2 INVENTOR. 5m. DAV/ps0 United States Patent Oflfice 3,1fi2,333 Patented Dec. 22, 1964 3,162,333 MULTWLE-PART PLASTIC PUMP 370R LIQUIDS Emil Davidson, Scarsdale, N.Y., assignor to Guiid Molders, Ina, Elrnsford, N.Y., a corporation of New York Filed July 3d, 1959, der. No. 830,565 7 Claims. (Cl. ZZZ-07) The present invention relates generally to pumps, and in particular to a small manual pump adapted to be incorporated in a container-top dispenser.

There is at present a great tendency in the toiletries industry to package liquid products in containers equipped with push-button container-top dispensing devices for the convenience of the customer in dispensing the product. Many manufacturers have resorted to pressure cans, but these require high internal pressures and they continue to eject the contents of the can at a rapid rate until the operating button is released. A need has thus been felt for a pump type dispensing device capable of drawing up a liquid by a pumping action without relying on high in ternal pressures, thus avoiding the dangers which such pressures involve and permitting the use of construction materials other than metal. Such a pump should also be able to deliver a controlled amount of liquid on each successive operation thereof so that there would be no tendency for the dispenser to discharge more than the amount desired before there is an opportunity to shutolf the flow. However, it is also desired that like a pressure-can dispenser unit, the pump should be a versatile, compact, and self-contained unit capable of being afiixed to any container and conveniently operable by means of a button located at the top of the container. Additional requirements are that the pump be very simple to manufacture and assemble in quantity, and that it deliver a smooth flow.

It is therefore broadly an object of the present invention to provide a pump which will meet one or more of the aforesaid requirements. In particular it is an object of this invention to provide a cheap, simply assembled container-top pump unit which achieves even, controlled push-button dispensing operation.

In accordance with an illustrative embodiment demon strating features of the present invention there is provided a pump comprising a pump body fabricated of resilient material and shaped to define therein a pumping chamber. One wall of the pump body is sufiiciently resilient to be depressible for producing pressure changes in the pumping chamber. The pump body has a base opening communicating with the pumping chamber, while a base member fabricated of resilient material is inserted in the base opening to close 01f the pumping chamber and is formed with an intake conduit depending therefrom and communicating with the pumping chamber for delivering liquid thereto in response to pressure decreases therein. A one-way intake valve in the intake conduit allows a flow therethrough only inwardly toward the pumping chamber. The pump body is formed with an outlet passage, and a discharge spout is mounted on the pump body in communication with the outlet passage and pumping chamber for discharge of liquid therethrough in response to pressure increases in the pumping chamber. A one way outlet valve is mounted adjacent the outlet passage to allow a flow therethrough only outwardly from the pumping chamber. Advantageously, such an arrangement provides a pump which can be simply molded of a small number of parts, and these parts can be formed for rapid assembly by merely snapping them together.

The foregoing brief summary, as well as numerous additional advantageous features inherent in this invention, may best be appreciated by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a perspective view of a first embodiment of a dispenser pump in accordance with this invention, with the rotatable discharge spout thereof illustrated in phantom in the stored position;

FIG. 2 is an enlarged vertical cross-section of the pump of FIG. 1;

FIG. 3 is an exploded side view, with parts sectioned, of the pump of FIG. 1;

FIG. 4 is a perspective view of a second embodiment of a dispenser pump in accordance with this invention;

FIG. 5 is an enlarged vertical cross-section of the pump of FIG. 4;

FIG. 6 is an exploded side view, with parts sectioned, of the pump of FIG. 4;

FIG. 7 is a perspective view of a third embodiment of a dispenser pump in accordance with this invention;

FIG. 8 is an enlarged vertical cross-section of the pump of FIG. 7;

FIG. 9 is an exploded side view, with parts sectioned, of the pump of FIG. 7;

FIG. 10 is a sectional view of one of the leaf springs of the pump of FIG. 7; and,

FIG. 11 is a similar sectional view of another leaf spring of the pump of FIG. 7.

Referring now specifically to FIGS. 13 of the drawings, a first illustrative embodiment of the invention herein consists of a dispenser pump, designated generally by the numeral 10, having a pump body 12, a base member 14, and an outlet conduit 16, all of which are molded of a relatively still? but resilient material such as hard polyethylene or a similar material. As a result, these various components can be easily adapted for snap interfits with each other, since materials of the type contemplated are both resilient enough to yield during the snapping operation yet hard enough to resist wear and hold securely once snapped into place. In addition, such materials readily lend themselves to being molded in ridged shapes such as are necessary to provide such snap interfits.

The pump body 12 is shaped to define therein a pumping chamber 18 in which pressure changes are caused which draw liquid from a container and subsequently discharge it. The pump body 12 is further shaped to define a base opening 20 through which the liquid enters the pumping chamber 18 and an outlet passage 22 through which it is discharged. The base member 14 is inserted within the base opening 20 and is formed with an integrally molded depending intake conduit 24 which communicates with the pumping chamber 18. A delivery tube 26 is force fit onto the lower end of intake conduit 24 and reaches into the container for delivery of the liquid from the interior of the container to the pumping chamber 18.

An intake valve 28 is provided, and includes an intake valve ball 30, which may be a metal head, mounted in the intake conduit 24 and cooperating with an annular valve seat constriction 28a integrally molded with and extending entirely about the periphery of the interior of intake conduit 24 to prevent any flow therethrough except upwardly from the container into the pumping chamber 18. Intake valve 28 further includes a pair of retainer shoulder constrictions 28b integrally molded with and projecting only from opposite sides of the interior of the intake conduit 24, which serve to retain the valve ball 30 in valve 28. Smaller prominences 280 between the retainer shoulder constrictions 28b provide by-pass channels for the liquid to pass through when valve ball 36) is carried upwardly against the retainer shoulder constrictions 28b. Similarly, the outlet conduit 16 is inserted into the outlet passage 22 and has an outlet valve 31 including an outlet valve ball 32, which may also be a metal bead, mounted in the outlet conduit 16 and cooperating with an annular valve seat constriction 31a integral-ly molded with and extending entirely about the periphery of the interior of the outlet conduit 16 to prevent any flow of liquid therethrough except outwardly from the pumping chamber 18. 'sArspring 34 serves to retain the valve ball 32 in place and to biasit against the .valve seat constriction 31a. ,The pump'body 12 is.

the urging of spring 38, to create a partial vacuum in umpin chamber 18 which draws liquid thereinto from the container. Each depression of the operating wall 12a increases the" pressure in pumping chamber '18.. In re,-

sponse, the outlet valve ball 32 *is, forced upwardly a short distance against the urging of spring 34, and the contents of pumping chamber'18 are forced out through outlet passage 22, then, through the space, left between. valveseat constriction 31a and the, momentarily upr'aised outlet val've ball 32, and then aredischarged through the outlet conduit 16. The flow in response to depression of the operating wall 12a can not retreat through the intake 7 conduit 24 back into-the container hecausethe, increase in pressure in pumping chamber 18 forces intakevalve ball downwardly against valveseat constriction 28a to seal off the intake conduit 26. when depressible wall 12a is released, spring 38 biases it back into its normal position, thusnexpanding pumping chamber 18'to'itspre1- vious volume and causing a partial vacuum therein. In response, the outlet valve ball 32 issres eated against the valve seat constriction 31a under the urging of spring 34, thus sealing oi the outlet conduit 16 and, preventing relief of the partial vacuum in the pumpin chamber 18 from that source. The vacuum can thus be relieved only by an upward flow oh liquid from, the container through delivery tube. 26' and intake conduit 24. Such aflflow. serves to lift intake valv ball 30 out of contact with the valve seat constriction 28a, leaving a space therebetween for the liquid to flow through.: The upward movement of intake valve ball 3'0v is limited by its abutmentagainst the retainer shoulder constrictions 28b, the liquid continuing to flow. through the by-pass channels formed by smaller prominences28e. The liquidipassing through. intake conduit,24' and reaching the pumping chamber 13 is then ready to be discharged in the manner described upon the next depression of operating wall 1242 Sinc'eonly. as much liquid can be discharged with each depression of depressi'ble wall 129 as has been drawn thereint'ov on the previous release of operating wall 12a, it will be appreciated that with this arrangement only a controlled amount v of liquid will be discharged, with each depression of the depressible Wall 12a.

In order to facilitate assembly of thepump 10, pump.

body 12 is integrally molded withan. annular container snap flange 12b encircling. base opening 20 which is adapted for snapping the pump 10 into place over. the mouth of a container. Pump body 12 is further integrally molded with. anannular snap socket 120 encircling base opening 20, and base member 14 is integrally molded with a correspondingly shapedmating annular snap ridge 14b sized to snap into the snap socket 120 for snapping member 14 into base opening 20. In the same manner pump body 12 is integrally molded with an annular snap socket 12d encircling outlet passage 22 and the outletconduit 16 is integrally molded with a'mating snap ridge 16a for snapping together the outlet conduit 16 and the pump body 12. In addition the outlet conduit 16 is sized to be rotatable within the outlet passage 22-; The

outlet passage 22 is located adjacent the depressible wall 12a, and the outlet'conduit 16 is integrally molded with adischarge spout 16b projecting therefo'rm which can thus be rotated from the operating position, indicated by the solid lines of FIG. 1,- to the stored position, indicated by the phantom lines thereof, in which it, extends across the operating wal-l 12a. Inthe-operating' position the discharge" spout lfib. projects outwardly, delivering liquid discharged therethrough ata location spaced from the pump 10. In the stored position the discharge spout 16b partially blocks access to the operating wall 12a and thus establishes a stored. condition-for the. entire pump and container assembly by preventingv or deterring depres-' sion of the 'depressible, wall 12a, In order tofurther facilitate assembly, of the pump 10,. the. constrictions 31a and either' 28a or 2812 are sized to permit, the inlet. and outlet valve hall's 30 add-32, to be snapped pastthe eonstrictio'n's' and into the" "Ives 28- 61: 31. It will now be, appreciated that he pump 10 canv be rapidl assembled from onlythrfee' easily molded olyethylene components plus two frietalvalve balls and two sprin s, and that these parts simply snap together to form a. compact and selfeonrained pum capable of delivering a controlled new in response to push-bottom operation thereof. p

Referring next speeifically-tojFIGs- 4-6 of theoremings, there is seen a second illustrative embodiment or the invention, various arts of which are assigned reference numerals. in the hundreds series'coires'pohding to the ref. erence numerals in the tensseiies', assigned to correspond? ihg parts of the first illustrative embodiment; Thus a dispenser pump, desi nated generally by the numeral 110', iiicludes a pump body 112 and a basemember 114. both molded frohihard polyethylene. A pumping hamber 118 and a base opening 120 and outlet passage 122 communicating therewith are defined by the pump body 112, and the latter is integrally molded with an annular container snap flange 1121; and an annular shop socket 112e, while the intakemeihber is integrally moldedvvifh a ihating snap ridge'114b and a depending-intake conduit 124. A delivery tube 126 i force fit over intake conduit 124, and an intake valve 128 is-i'o'riiied of an integrally molded annular valve seat constriction 128a coo erating with a metal int ke valve ball 130. integrally molded retainer constrictions 1281i are at opposite sides of intake conduit 124; and between them are formed unconstrictedby-pass' channels 128c for the liquid to pass through when intake valve b'all 130- is raised to, the upward limit of its travel.

In this embodiment of the invehtiohthe outlet conduit 11G i's" molded integrally wit-h the base, moiiilif 114 and projects upwardly therefrom toward .the outlet passage 122, while the dischargesp'o'ut 1112c is molded integrally with the pump'body 112 and is fixed placed thereon. The outlet conduit 116- is positioned n the base member 11410 be automatically inserted intoth outlet assag 122 upon'insertion of the base member 114 intoyth'e base op n. ing 12!); An outletvalve- 131 includes a metal outlet valve ball 132 which cooperates with an inte rally moldedall-1 nular valve seat constriction 1 31a; itsupward travel being limited by a .pair of integrally niolded oppose-d retainer shoulder constrictions 131'b between which are formed unconstricte'dby pass channels 131C. for the liquid to. pass through when outlet valve ball 132 is raised to the upward limitof its travel; A' part 116a passes through; outlet conduit 116 below the outlet valve 131 toallow for communication with the 'pumpingcham-ber 118,-.- The re tainer shoulder constrictions 131b, aresized to permit out let valve ball 132 to be snapped past into the outlet valve 131 for rapid assembly of the pump 110. It will now be appreciated that pump 110 is especially convenient to assemble, consisting of only two easily molded polyethylene components plus two metal valve balls and one spring, these parts readily snapping together to form the improved type of pump described herein, and insertion of the outlet conduit 116 into the outlet passage 122 being accomplished automatically during snapping of the base member 114 into base opening 120.

It will also be realized that the operation of the pumps and 110 is dependent upon the mobility of the outlet valve balls 32 and 132 in the outlet valves 31 and 131 respectively. These outlet valve balls must move upwardly in response to the pressure increase in pumping chambers 18 and 118 caused by depression of the depressible walls 12a and 112a to allow liquid to be discharged through outlet conduits 16 and 116. In this connection a problem is raised by the tendency of deformation of the depressible walls 12a and 112a to cause collateral deformation of the adjacent portions of the pump bodies 12 and 112 which define the respective outlet passages 22 and 122. Thus, if the outlet valve balls 32 and 132 were mounted directly in the outlet passages 22 and 122, deformation of the latter during pump operation would tend to pinch and bind the outlet valve balls 32 and 132, thus interfering with the essential upward movement of these members. As a result the discharge of liquid by the pumps 10 and 110 would at best be halting and uneven. It is therefore an advantageous feature of this invention that the outlet valve balls 32 and 132 are mounted within outlet conduits 16 and 116 which communicate with the re spective outlet passages 22 and 122, and not directly in the outlet passages themselves. In the first illustrative embodiment, furthermore, the arrangement is seen to be such that the outlet valve ball 32 is positioned up near the outer end of the outlet passage 22 and in substantially the same horizontal plane as the depressible wall 12a. In this way the pinching and binding effect is minimized because the collateral deformation suffered by the outlet passage 22 decreases with decreasing distance from the plane of the depressible wall 12a, owing to the resulting decrease in the radius over which the deforming motion occurs. The second illustrative embodiment also presents an additional advantageous feature in that the outlet conduit 116 is integral with, and is thus reinforced by, the relatively thick and inflexible base member 114. For this reason the outlet conduit 116 is better able to resist any deforming stress which may be exerted thereon by the portion of pump body 112 surrounding the outlet passage 122 in response to deformation of the depressible wall 112a. Thus smoother operation of the pumps .10 and 110 is achieved.

FIGS. 7-11 of the drawings show a third illustrative embodiment of the invention similar to the second embodiment illustrated in FIGS. 4-6, but differing therefrom in certain important respects. The various parts of this third embodiment are assigned reference numerals in the two hundreds series corresponding to the reference numeral in the hundreds series and the tens series assigned to corresponding parts of the second and first embodiments respectively. Thus a dispenser pump, generally designated by the numeral 210, includes a pump body 212 and a base member 214. The former defines a pumping chamber 218 and a base opening 220 therebelow, and

'is integrally molded with an annular container snapflange 2121) and an annular snapsocket 2120 which makes a snap fit with an integrally molded snap ridge 214b on the base member. The latter is also formed with a depending intake conduit 224 over which a delivery tube 226 is force fit. An intake valve 228 is provided and includes an integrally molded annular valve seat constriction 228a and opposed integrally molded retainer constrictions 228b. Between the opposed retainer constrictions 2255b are unconstricted bypass channels 2281:. An

6 intake valve ball 230 rides between the valve seat and retainer constrictions and cooperates with the valve seat constriction 228a to control the flow of liquid through the valve 228, the liquid being able to pass through the bypass channels 2280 when the intake valve ball 230 is raised upwardly against the retainer constrictions 22812. The intake valve ball 231) can be snapped past either of the constrictions 228a and 228b in assembling the valve 228. The pump body 212 is formed with a depressible operating wall 212a which is flexed to cause pressure changes in the pumping chamber 218 which operate the valve 228 and cause an intermittent passage of liquid therethrough in the manner described above in connection with the first and second embodiments.

An outlet passage 222 is integrally formed on the pump body 212 within the pumping chamber 218 and is adapted to receive an outlet conduit 216 which is molded integrally with the base member 214 and projects upwardly therefrom. The outlet conduit 216 is automatically inserted into the outlet passage 222 when the base member 214 is inserted and snapped into place in the base opening 220. An outlet valve 231 is provided for controlling the flow of liquid outwardly from the pumping chamber 218 and includes an outlet valve ball 232 which cooperates With an integrally molded annnular valve seat constriction 231a to provide an intermitten flow of liquid through a passageway 216a bored through the side of the outlet conduit 216 below the outlet valve ball 232. A discharge spout 212e is integrally formed on the pump body 212 and projects outwardly therefrom and communicates with the outlet conduit 222 above outlet valve ball 232 to provide a pathway for the final ejection of the liquid from the pump 210.

In this embodiment of the invention the discharge spout 212e is seen to consist of a long, thin, slightly tapered cylindrical tube, which for the purposes of stiffening the discharge spout 212e and giving it a more pleasing profile is provided with a pair of depending skirts 255) which integrally join the discharge spout 212e along the length thereof and the main wall of the pump body 212 below the spout 212e and are integrally molded therewith. Skirts 250 are spaced apart and are arranged on either side of the discharge spout 212e and are provided with curved lower edges which give the discharge spout 212e a more pleasing appearance when seen in profile. The skirts 250 also serve to lend rigidity to the discharge spout 2122. v

The outlet conduit 216 in this embodiment of the invention is formed with an integrally molded leaf spring 260 which projects inwardly and downwardly from the inside wall of the conduit 216 and bears downwardly upon the outlet valve ball 232 to exert a downward resilient biasing force thereon which keeps the valve ball 232 seated against the outlet valve seat constriction 231a. Thus the leaf spring 260 of this embodiment functions in essentially the same manner as the coil spring 34 of the embodiment of FIGS. l-3, but leaf spring 260 has the great advantage of being molded integrally with base member 214 in the manufacture thereof. To lend additional rigidity to the leaf spring 260, the latter is formed with a longitudinal rib 260a which is best seen in the cross-sectional view of FIG. 11. The outlet valve ball 232 may be inserted past the leaf spring 260 in the assembly of the pump 210 by inserting a small hooked tool into the outlet conduit 216 and pulling back the leaf spring 264) to permit the outlet valve ball 232 to be moved past the leaf spring and into its place seated against the outlet valve seat constriction 231a. In the operation of the pump 21%, when the liquid inside the pumping chamher 218 is forced through the passage 216a and upwardly through the outlet conduit 216, the valve ball 232 is raised by the pressure in the pumping chamber 218 against the biasing force of leaf spring 260 and forced out of contact with the valve seat constriction 231a to permit the liquid tion by the depressible' operatingWa-ll 2120 s51 cases to pass. 2'60 is effective to bias the downwardly against the valve seat constriction 231ato prevent the pump 210 fromidrawing suction backwardly through-the discharge spout 212a on the subsequent in-.

I When the flow of liquid stops, the leafspringt outlet valve ball 232 back a take stroke. The liquid: which passes through the outlet an: opening. 262 in the wall of the outlet conduit 216 ad= jacent the rearward endof outlet passage 212e.

An additional feature presented'by this embodiment of the invention is the provision: of anupwardly facing open cup" 270? on the upper surface: of the basemember 214 which surrounds the openingthrough which the liquid isdelivered from the intake conduit 224.- This cup 2 -70w valve 231 is permitted to pass through thewalls of outletconduit 216 and into the discharge spout 21 2c through pump 210 are thewith. the respective valves 228: and 231 formed on the base member 214; and it is not necessaryw-ith embodiment to provide any springs or other additional operating parts not integral with the aforesaid molded members; V V T 7 'It is therefore seen: that: in each of its embodiments the present invention provides acompact, self-contained dispenser pump unit which consists ofa small number 'of easily molded parts which assemble by snapping together. The pump snaps-over the mouth of a conmember 214 is inserted into the base opening 220' and snapped into place therein. The leaf spring 280 is sufficiently ftall to be" bent out of its: normal configura= when the base member 214- assumes its operating position within 1 the base opening 220. Thus'the leaf spring 280, because;

it is held by contact with the depressible 'operatin-gwall 212a in a flexed condition, exerts aconstant outward biasing-force upon the depressible operating wall 212a Thereforeit will be readily appreciated thatthe leaf spring 2180- serves in much the same manner as the coil springs 38 and 1-38 of thefirst two embodiments-to snap thedepressibleoperating wall 212:! outwardly to performthe intake stroke after it has 'been'pressed inwardly on the discharge strokes Irr order to provide greatenspr-ing iness and rigidity for the leaf spring 280, the latter is integrally molded with a longitudinal rib 280a which is best seen in the cross-sectional ViGWQfFIG'. 10.- 4

As anadditional: advantageous feature of this illustrative embodiment-of the invention, the intake andoutlet valve seat constrictions 228a and 231a respectively are not cut in a relatively perpendicular or obliqueangular relationship to the internal walls of the'intakeand outlet conduits 224 and- 2 16 respectively, but instead are pro vided with re-entrant surfaces 290 and 292 respectively which are cut sharply downwardly so as to-make an acute angle with the internal walls of the intake and outlet-con duits 224 and 216 respectively. It. hasbeen found inv practice that a valve seat of this shapeprovidesabetter sealing fit againstthe metal valve. balls 230 and 23-2, and thus achieves a more efficient valvin-g action.

Thusit willbeappreciated that in addition to exhibiting. substantially the advantagesof. the first and-second illustrative embodiments of the invention this third embodiment provides certain additional advantageous features, including. avoiding the necessity for any metalcoil springs, providing a more rigid and more esthetic discharge spout,,pr'oviding a more efllcient valve seatconstruction, and providing. .a cupwhich holds a supply oi the liquid in readiness for discharge while waiting for;

the next discharge stroke of the pump 210. It' will also be appreciated that the pump 2 consist of only two molded members, the pump body 212 abase' member 214 which integrally include almost all the working parts of the pump and which may be readily snap fit together during the assembly of the pump 2'10' in" such a way that once" the snap" fit is accomplished the various parts of the pump 210' are automatically arranged in' Working order; The only additional members required for the tainer and features operation by a type of depressible push-button at the top ofrthe container, delivers a controlled amount of liquid with each depression thereof,

and in addition achieves a smooth flow without binding of its working parts. y r

The particulars of the foregoing description are provided merely for purposes of illustration and are subject to a considerable latitude of modification without departing fromthe novel teachings disclosed herein; Accordingly, the. scope of this invention is intended to be limitedonly as defined iii-the appended claims; which should be accorded a: breadth of interpretation consistent with this specification:

I claim: Y

1 A pump comprisingv a-pump body fabricated of resilient materialr-and shaped to define therein a pumping chamber, an upperwall. of said pump body being sufiiciently resilient to be depressible for producing pressure changes in said pumping chamber, said pump body having:

a base opening communicating; with said pumping chamber, mounting means on said-pump body for mounting saidpump atthe mouth ,of a liquid containena base member fabricated of resilient material inserted in said base opening to:close elf said pum in chamber and the mouth of said container and formed with an intake conduit depending therefrom and communicating with said pumping chamberfor delivering liquid thereto in responsetopressure decreases therein; a one-Way int'akc. valve in said-intake conduit-- allowing: a flow the'rethrough only inwardly toward said pumping-chamber, an outlet passage formed in. said pump body, said base member being formed witlranoutlet conduit projecting: therefrom snugly into said outletpassage; said outlet conduit communicating; with said outletpassage and said pumping chamber for dischargeof liquid thertlirough in response to pressure increases insaidpurhpingchamber, a one-way outlet valve insaid outlet conduit allowing a flow therethrough' only outwardly from: said pumping chamber, said intake and outlet valves each including constrictions formed within said intake and outlet conduits respectively shaped to define an annular valve seat and a retainer shoulder and a valve me'mber slidablein said conduit between said valve} seat and retainer shoulder and sized for a sealing fit with saidvalve seat and to'- be snapped past at least one of said valve constrictions; and means on said base member and saidpump body shaped for a snap fit of said base member into said base opening, said base member being: integrally formed witha resilient leaf spring projecting upwardly therefrom'to exert an outwardbiasing force on said depressible, pump" body wall.

2 A pump comprising a pump body fabricated of resilient materiah and shaped to define therein a pumping chamber, an. upper wall of said pump body'being sufiicientl-y resilient tobe depressible" for producing pressure changes'insaid pumping chamber, said pump'body' having I a base'openin-g communicating with said pumping chamtwo metal 'yalve balls 230 and 232, which are also readily snapped intooperative relationship 9 spouse to pressure decreases therein, a one-way intake valve in said intake conduit allowing a flow therethrough only inwardly toward said pumping chamber, an outlet passage formed in said pump body, said base member being formed with an outlet conduit projecting therefrom into said outlet passage, said outlet conduit communicating with said outlet passage and said pumping chamber for discharge of liquid therethrough in response to pressure increases in said pumping chamber, a one-way outlet valve in said outlet conduit allowing a flow therethrough only outwardly from said pumping chamber, said intake and outlet valves each including constrictions formed within said intake and outlet conduits respectively shaped to define an annular valve seat and a retainer shoulder and a valve member slidable in said conduit between said valve seat and retainer shoulder and sized for a sealing fit with said valve seat and to be snapped past at least one of said valve constructions, and means on said base member and said pump body shaped for a snap fit of said base member into said base opening, said outlet conduit being formed with a resilient leaf spring projecting thereinto to bias said outlet valve member against said outlet valve seat.

3. A pump comprising a pump body fabricated of resilient material and shaped to define therein a pumping chamber, an upper wall of said pump body being sufficiently resilient to be depressible for producing pressure changes in said pumping chamber, said pump body having a base opening communicating with said pumping chamber, mounting means on said pump body for mounting said pump at the mouth of a liquid container, a base member fabricated of resilient material inserted in said base opening to close off said pumping chamber and the mouth of said container and formed with an intake conduit depending therefrom and communicating with said pumping chamber for delivering liquid thereto in response to pressure decreases therein, a one-way intake valve in said intake conduit allowing a flow therethrough only inwardly toward said pumping chamber, an outlet passage formed in said pump body, said base member being formed with an outlet conduit projecting therefrom into said outlet passage, said outlet conduit communicating with said outlet passage and said pumping chamber for discharge of liquid therethrough in response to pressure increases in said pumping chamber, a one-way outlet valve in said outlet conduit allowing a flow therethrough only outwardly from said pumping chamber, said intake and outlet valves each including constrictions formed within said intake and outlet conduits respectively shaped to define an annular valve seat and a retainer shoulder and a valve member slidable in said conduit between said valve seat and retainer shoulder and sized for a sealing fit with said valve seat and to be snapped past at least one of said valve constrictions, and means on said base member and said pump body shaped for a snap fit of said base member into said base opening, said base member being integrally formed with a first resilient leaf spring projecting upwardly therefrom to exert an outward biasing force on said depressible pump body wall, said outlet conduit being formed with a second resilient leaf spring projecting thereinto to bias said outlet valve member against said outlet valve seat, said first and second leaf springs being formed with stiffening ribs.

4. A pump comprising a pump body fabricated of resilient material and shaped to define therein a pumping chamber, an upper wall of said pump body being sufliciently resilient to be depressible for producing pressure changes in said pumping chamber, said pump body having a base opening communicating with said pumping chamber, mounting means on said pump body for mounting said pump at the mouth of a liquid container, a base member fabricated of resilient material inserted in said base opening to close oif said pumping chamber and the mouth of said container said base member including an integral leaf spring having a portion thereof lying flush with said upper wall for urging said upper wall from a depression position, said base member being formed with an intake conduit depending therefrom and communicating with said pumping chamber for delivering liquid thereto in response to pressure decreases therein, a one-way intake valve in said intake conduit allowing a flow therethrough only inwardly toward said pumping chamber, an outlet passage formed in said pump body, said base member being formed with an outlet conduit projecting therefrom into said outlet passage and fitting snugly therein, said outlet conduit communicating with said outlet passage and said pumping chamber for discharge of liquid therethrough in response to pressure increases in said pumping chamber, a one-way outlet valve in said outlet conduit allowing a flow therethrough only outwardly from said pumping chamber, said intake and outlet valves each including constrictions formed within said intake and outlet conduits respectively shaped to define an annular valve seat and a retainer shoulder and a valve member slidable in said conduit between said valve seat and retainer shoulder and sized for a sealing fit with said valve seat and to be snapped past at least one of said valve constrictions, and means on said base member and said pump body shaped for a snap fit of said base member into said base opening, said intake and outlet valve seat contrictions being formed with re entrant surfaces.

5. A pump adapted to be mounted on the neck of a liquid container comprising a pump body fabricated of a resilient plastic and defining therein a pumping chamber, said pump body having an integral upper Wall portion which is sufficiently resilient to be depressible and deformable for producing pressure changes in said pumping chamber, said pump body having a depending wall portion integral with said upper wall portion and defining a base opening communicating with said pumping chamber, means integrally of said depending Wall portion and bounding said base opening defining an inwardly opening base-receiving socket, a base member received within said base opening and dimensioned to be snap fitted into said base-receiving socket and including a depending integral intake conduit, said basemember being snap fitted into said base-receiving socket to bridge and close said base opening such that said intake conduit is in communication with said pumping chamber for delivering liquid thereto in response to pressure decreases in said pump chamber, a one-way intake valve in said intake conduit arranged to allow a flow therethrough only toward said pumping chamber, means integral with said base member and cooperating with said pump body defining an outlet conduit in communication with said pumping chamber, a discharge spout integral with said pump body and in communication therewith through said outlet conduit, a one-way outlet valve in said outlet conduit arranged to allow a flow therethrough only outwardly from said pumping chamber to said discharge spout in response to pressure increases in said pumping chamber, and means projecting below said depending wall portion outwardly of said base-receiving socket and defining a neck-receiving socket adapted to receive the neck of said container for mounting said pump thereon.

6. A pump according to claim 5 wherein said base member is formed with an integral resilient spring member which is shaped to underlie and bear against said upper wall portion and biases the same to its normal position.

7. A pump adapted to be mounted on the neck of a liquid container comprising a pump body fabricated of a resilient plastic and defining therein a pumping chamber, said pump body having an integral upper wall portion which is sufficiently resilient to be depressible and deformable for producing pressure changes in said pumping chamber, said pump body having a depending Wall portion integral with said upper wall portion and a depending intake conduit, s'aid' Base member being.

formed with an integral resilient spring member which bears against said upper Wall portion and biases the" same to its normal positiomjsaid base member being snap fitted iiito said base-receiving socketto bridge and close said baseop'enifig such that said intake conduit is in communication with said pumpin chamber for delivering liquid thereto in response" to pressure decreases in said pump chariilier a one-way intake valve in said intake conduitarranged to allow a flaw thefetlir'ougli only toward saidpur'npiilg chamber, means defining an outlet conduit in eommunic'atidnwith said pumfiing chamber, a discharge spout in commutii'ca'tiofirwitli' said outlet conduit, a one-way outlet valve in said outlet conduit arranged to" allow a flow there through only outwardly from said fiumpin chamber to said discharge spent in response topr'e'ssure increases in said pumping chamber, and mounting means; extending-below said depr'iding wail portion and afifanged' to engage the neck 6f said container for mounting said fiun'ip onsaidcontainer witli said' Basemember bridging said neck;

amt-elites Cited 016 me r: tl'iis patent UNITED S ATES .PATEN'Ts- 

1. A PUMP COMPRISING A PUMP BODY FABRICATED OF RESILIENT MATERIAL AND SHAPED TO DEFINE THEREIN A PUMPING CHAMBER, AN UPPER WALL OF SAID PUMP BODY BEING SUFFICIENTLY RESILIENT TO BE DEPRESSIBLE FOR PRODUCING PRESSURE CHANGES IN SAID PUMPING CHAMBER, SAID PUMP BODY HAVING A BASE OPENING COMMUNICATING WITH SAID PUMPING CHAMBER, MOUNTING MEANS ON SAID PUMP BODY FOR MOUNTING SAID PUMP AT THE MOUTH OF A LIQUID CONTAINER, A BASE MEMBER FABRICATED OF RESILIENT MATERIAL INSERTED IN SAID BASE OPENING TO CLOSE OFF SAID PUMPING CHAMBER AND THE MOUTH OF SAID CONTAINER AND FORMED WITH AN INTAKE CONDUIT DEPENDING THEREFROM AND COMMUNICATING WITH SAID PUMPING CHAMBER FOR DELIVERING LIQUID THERETO IN RESPONSE TO PRESSURE DECREASES THEREIN, A ONE-WAY INTAKE VALVE IN SAID INTAKE CONDUIT ALLOWING A FLOW THERETHROUGH ONLY INWARDLY TOWARD SAID PUMPING CHAMBER, AN OUTLET PASSAGE FORMED IN SAID PUMP BODY, SAID BASE MEMBER BEING FORMED WITH AN OUTLET CONDUIT PROJECTING THEREFROM SNUGLY INTO SAID OUTLET PASSAGE, SAID OUTLET CONDUIT COMMUNICATING WITH SAID OUTLET PASSAGE AND SAID PUMPING CHAMBER FOR DISCHARGE OF LIQUID THERETHROUGH IN RESPONSE TO PRESSURE INCREASES IN SAID PUMPING CHAMBER, A ONE-WAY OUTLET VALVE IN SAID OUTLET CONDUIT ALLOWING A FLOW THERETHROUGH ONLY OUTWARDLY FROM SAID PUMPING CHAMBER, SAID INTAKE AND OUTLET VALVES EACH INCLUDING CONSTRICTIONS FORMED WITHIN SAID INTAKE AND OUTLET CONDUITS RESPECTIVELY SHAPED TO DEFINE AN ANNULAR VALVE SEAT AND A RETAINER SHOULDER AND A VALVE MEMBER SLIDABLE IN SAID CONDUIT BETWEEN SAID VALVE SEAT AND RETAINER SHOULDER AND SIZED FOR A SEALING FIT WITH SAID VALVE SEAT AND TO BE SNAPPED PAST AT LEAST ONE OF SAID VALVE CONSTRICTIONS, AND MEANS ON SAID BASE MEMBER AND SAID PUMP BODY SHAPED FOR A SNAP FIT OF SAID BASE MEMBER INTO SAID BASE OPENING, SAID BASE MEMBER BEING INTEGRALLY FORMED WITH A RESILIENT LEAF SPRING PROJECTING UPWARDLY THEREFROM TO EXERT AN OUTWARD BIASING FORCE ON SAID DEPRESSIBLE PUMP BODY WALL. 